Thanks for a great plugin, however I have found a bug which I find quite annoying. I've coded a plugin which utilizes ffmpeg to encode videos to ogv/mp4 through the media uploader but your plugin keeps recognizing these files as images.

What happens is that is tries to generate sizes for my videos, resulting in a crash and an error message through the media uploader. This in turn renders my plugin unusable and I have to disable Dynamic Image Resizer while uploading a video.

I've tried to patch it myself but I didn't want to mess with your code too much. Could you please look into this issue and try to make sure the plugin only runs when the uploaded file is indeed an image?